of this secondary radiation. In order to study the directionality of this effect, Cerenkov designed the experimental setup illustrated in Figure 2 using a conical mirror that reflected incoming radiation against a photographic plate located above a fluid-filled vessel. Photographs of the reflected light represent cases of ordinary luminescence
A sigil (/ËsÉªdÊÉl/; pl. sigilla or sigils; from Latin sigillum seal) is a symbol used in magic. The term has usually referred to a type of pictorial signature of a demon or other entity; in modern usage, especially in the context of chaos magic, it refers to a symbolic representation of the magician's desired outcome.
The term sigil derives from the Latin sigillum, meaning seal, though it may also be related to the Hebrew ×¡×××× (segula meaning word, action, or item of spiritual effect, talisman). The current use of the term is derived from Renaissance magic, which was in turn inspired by the magical traditions of antiquity.